Potterton Ultra 2 30 DV Fault codes & diagnostics

2 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Regular Natural Gas 8.8 kW 1997-2004 Discontinued
GC Numbers 41-607-5041-607-5141-607-5241-607-5341-607-5441-607-5541-607-5641-607-5741-607-5841-607-5941-607-6541-607-6641-607-6741-607-6841-607-6941-607-7041-607-7141-607-7241-607-7341-607-74
Download the Potterton Ultra 2 30 DV manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Fault codes

All 2 documented codes

Tap any card for details

Lockout (Rapid Flashing Red)

Your boiler has failed to start after three attempts, likely because it is struggling to find a stable gas supply or has air trapped in the system.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for Lockout (Rapid Flashing Red)
Red LED: FLASHING

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.

High Engineer only £150-300

Parts commonly replaced

  • Pump
  • Central heating system filter
  • Overheat thermostat
  • Diverter valve
Full explanation for Red LED: FLASHING
Status & diagnostic codes

2 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Green light flashes rapidly Status Your boiler is attempting to start but failing to stay lit, which means it cannot provide heat or hot water. Green light On only Status Your boiler is operating normally and is currently heating your water or home as requested.